RSLinx 2.57 is currently available int the Links section of the board but not yet available from Rockwell Software.
Confirmed it works on Windows 7 32/64bit.

Oracle VirtualBox is the best virtual pc software I've used. However, RSLinx does occasionally have trouble finding PLCs on the network when run from VirtualBox. Might depend on your setup. Already having the processors network location in the project file seems to solve the problem (download to controller from an xp machine, save project online, open project in virtual machine).